diff --git a/rpc/README.md b/rpc/README.md
index c1cba7f132..f3800eeb65 100644
--- a/rpc/README.md
+++ b/rpc/README.md
@@ -4986,6 +4986,10 @@ For example, a cellbase transaction is not allowed in `send_transaction` RPC.
 
 (-1109): The transaction is expired from tx-pool after `expiry_hours`.
 
+### Error `PoolRejectedTransactionBySizeLimit`
+
+(-1110): The transaction exceeded maximum size limit.
+
 ### Error `Indexer`
 
 (-1200): The indexer error.
@@ -6329,14 +6333,15 @@ TX reject message
 
 `PoolTransactionReject` is a JSON object with following fields.
 
-*   `type`: `"LowFeeRate" | "ExceededMaximumAncestorsCount" | "Full" | "Duplicated" | "Malformed" | "DeclaredWrongCycles" | "Resolve" | "Verification" | "Expiry"` - Reject type.
+*   `type`: `"LowFeeRate" | "ExceededMaximumAncestorsCount" | "ExceededTransactionSizeLimit" | "Full" | "Duplicated" | "Malformed" | "DeclaredWrongCycles" | "Resolve" | "Verification" | "Expiry"` - Reject type.
 *   `description`: `string` - Detailed description about why the transaction is rejected.
 
 Different reject types:
 
 *   `LowFeeRate`: Transaction fee lower than config
 *   `ExceededMaximumAncestorsCount`: Transaction exceeded maximum ancestors count limit
-*   `Full`: Transaction pool exceeded maximum size or cycles limit,
+*   `ExceededTransactionSizeLimit`: Transaction exceeded maximum size limit
+*   `Full`: Transaction are replaced because the pool is full
 *   `Duplicated`: Transaction already exist in transaction_pool
 *   `Malformed`: Malformed transaction
 *   `DeclaredWrongCycles`: Declared wrong cycles
diff --git a/util/app-config/src/legacy/tx_pool.rs b/util/app-config/src/legacy/tx_pool.rs
index 00c0c6390d..bf82ecc1af 100644
--- a/util/app-config/src/legacy/tx_pool.rs
+++ b/util/app-config/src/legacy/tx_pool.rs
@@ -12,7 +12,7 @@ const DEFAULT_MAX_TX_VERIFY_CYCLES: Cycle = TWO_IN_TWO_OUT_CYCLES * 20;
 // default max ancestors count
 const DEFAULT_MAX_ANCESTORS_COUNT: usize = 125;
 // Default expiration time for pool transactions in hours
-const DEFAULT_EXPIRY_HOURS: u8 = 24;
+const DEFAULT_EXPIRY_HOURS: u8 = 12;
 // Default max_tx_pool_size 180mb
 const DEFAULT_MAX_TX_POOL_SIZE: usize = 180_000_000;